What type of chemical reaction does the reaction belong to?
Hydrogen sulphide gas reacts with oxygen gas to form solid sulphur and liquid water.

Synthesis reaction

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Precipitation reaction

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Redox reaction

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Decomposition reaction

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Solution

The correct option is D Redox reaction
Hydrogen sulphide ( $H_{2} S$ ) reacts with oxygen ( $O_{2}$ ) to form solid sulphur ( $S$ ) and water( $H_{2} O$ ). It is a redox reaction as both oxidation of hydrogen sulphide to sulphur and reduction of oxygen to water takes place. The equation can be written as:
$2 H_{2} S + O_{2} \to 2 S + 2 H_{2} O$

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Question 33
Write a balanced chemical equation for each of the following reactions and also classify them.

(a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.

(b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.

Identify the type of reaction and product(s) formed when hydrogen peroxide $H_{2} O_{2}$ is heated.

Calcium (solid) + Water (liquid) \underset{}{\to} Calcium hydroxide (solution) + Hydrogen (gas)

Sulphur dioxide (gas) + Oxygen (gas) \underset{}{\to} Sulphur trioxide (gas)

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